# Scalar Production in Association with a Z Boson at LHC and ILC: the Mixed BEH-Radion Case of Warped Models

## TL;DR

This paper investigates the production of a radion scalar particle in association with a Z boson within warped extra-dimensional models, highlighting the potential of the ILC to explore this new physics signature.

## Contribution

It provides a detailed analysis of radion production with Z bosons, including Higgs-radion mixing effects, and compares the discovery potential at LHC and ILC.

## Key findings

- LHC can constrain some radion parameter space
- ILC can explore a larger parameter space
- High-precision Higgs measurements complement radion searches

## Abstract

The radion scalar field might be the lightest new particle predicted by extra-dimensional extensions of the Standard Model, thus possibly leading to the first signatures of new physics at the LHC. We perform a study of its production in association with a $Z$ boson in the custodially protected warped model with a brane-localised Higgs boson addressing the gauge hierarchy problem, with Higgs-radion mixing effects included. While the considered radion production at the LHC would constrain some parts of the parameter space, it is only the ILC program that will be able to cover a significant part of this space through the studied process. Complementary tests of the same theoretical parameters can be realised through the high accuracy measurements of the Higgs couplings at ILC.